公开(公告)号：US09666312B2

公开(公告)日：2017-05-30

申请号：US14442934

申请日：2012-11-16

申请人： Hitachi-GE Nuclear Energy, Ltd.

发明人： Sho Kuroita ,  Sadakatsu Sawahata ,  Yasuhiro Mabuchi ,  Hiroaki Asakura ,  Fumihito Hirokawa

IPC分类号： G21C15/26 ,  G21C1/08

CPC分类号： G21C15/26 ,  G21C1/084 ,  Y02E30/31

摘要： A chimney arranged inside of a reactor pressure vessel of a natural-circulation boiling water reactor is provided. The chimney includes plural flow channels which guide a steam-water two-phase flow generated in a reactor core to the upper part of the reactor pressure vessel. Each of the flow channels is formed by plural flow channel separation walls whose lower-most part is supported by a chimney lattice plate. Chimney spacers that support a horizontal load are arranged between the flow channel separation walls of the adjacent flow channels. Chimney support rings that support the horizontal load are arranged at the outermost periphery of the plural flow channels that are supported by the chimney lattice plate.